Water-tube boiler.



T. T. PARKER.

WATER TUBE BOILER.

APPLICATION FILED MAY 6. 1915.

Patented Mar. 20, 1917.

Fig.1.

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INVENTOR izfiiomeys,

THOMAS T. PARKER, 01 NEW YORK, N. Y.

WATER-TUBE BOILER.

Application filed May 6, 1915.

To all whom it may concern:

Be it known that I, THOMAS T. PARKER, a citizen of the United States of America, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in ater-Tube Boilers, of which the following is a specification.

This invention relates to water tube boilers and aims to provide certain improvements therein.

The invention is particularly directed to means for improving the circulation whereby a greater efliciency is attained. The preferred form of the invention comprises a boiler of the horizontally inclined type wherein the tubes are lower at their front or firing end, and are connected to a steam and water drum which is usually located above the front end and extended transversely of the tubes. The preferred type of boileris provided with horizontally arranged baffles so that the products of combustion are caused to travel along lines which are parallel to the tubes. Across the upper baffle in this or in any other type of boiler to which the invention is applicable, I provide a series of downcomer tubes which connect the front and rear headers. Below the entrance to the upper ends of such tubes is arranged a baflle which preferably extends substantially across the upper header and greatly facilitates the action of the boiler in separating the steam and water so that the latter may flow promptly down the downcomer tubes.

In the drawings,

Figure 1 is a longitudinal section showing one embodiment of the invention;

Fig. 2 is a front view of Fig. 1 partly in section.

In the drawings let A indicate the furnace and B the bridge which may be of any suitable construction. The main bank of tubes is indicated by the reference letter C and these, in the preferred form illustrated, are inclined upward rearwardly so that the front or firing ends of the tubes are at a lower level than the rear ends. The result of this construction is that steam is mainly generated at the rear end of the bank of tubes, and passes upwardly through tube D to the steam and water drum E which is preferably arranged at the front end of the boiler and transversely across the series of tubes. The water level in the drum E is indicated by the reference letter F and live Specification of Letters Patent.

' Patented Mar. 20, 1917.

Serial No. 26,194.

steam istaken from the outlet G while water circulates from the drum downwardly to the front end of the bank of tubes through pipes H.

Preferably the front water box (designated by the letter J) extends entirely across the ends of the tubes in the main bank and is common to all or substantially all of the tubes, the box being preferably of unitary structure and affording free communication with all of the tubes. The water box J is connected with the tubeI-I and receives water from the drum E. A similar construction of water box is also preferably adopted at the rear as shown at K. Preferably also I use two or more horizontally inclined bafile walls made of fire brick or tile, the lower of which is shown at L, which bafiie is preferably arranged upon the first row of tubes in order to obtain the cooling effect of the water or steam at its under side. This bafile plate or wall compels the products of combustion to pass rearwardly to a point near the back of the furnace before coming in contact with the main bank of tubes. Above and suitably spaced from the lower baffle L is a second bafiie M which cuts off the upward movement of the products of combustion and compels them to travel forwardly to a. point at or near the front of the bank. Ordinarily, if the bank of tubes is nine (9) or less in number vertically, the second baffle plate M will be arranged above the bank, but closely adjacent'to the top tubes. If a greater number of tubes isemployed, a third baffle N is provided corresponding to the battle L which compels the products of combustion to again pass rearwardlv before leaving the main bank of tubes. The products of combustion pass into the chamber P leading to the smokestack or chimney Q.

In the rear water box K there is a rapid evolution of steam and this rises upwardly with the entrained water toward the steam pipe D. According to the present invention I provide a batlle R which extends across the inner side of the water box and tends to separate the particles of steam and water. The separated water tends to drop to the left of the bafile while the particles of steam ascend. In order to provide a return flow of such water to the tube system of the main bank of tubes I construct the boiler with a series of downcomer tubes S which are located above the top baffle and hence in the main out of the direct path of impingement. of the hot gases. These downcomer tubes extend practically across the boiler and discharge into the front water box J. The provision of the baffle R greatly increases the efficiency of the downcomer tubes in returning water to the front water box. By this means also the circulation tubes leading from the top of the rear water box to the steam and water drum are required to carry but little entrained water so that the circulation of the water in the boiler is thus further improved.

The present invention provides a boiler by which the circulation is greatly improved and which consequently is more efficient than other boilers of this type. It will be understood that while I have described the invention with reference to a particular construction of boiler, it is not limited to this construction, but may be used in connection with various other boilers, and it will also be understood that various changes may be made therein without departing from the spirit of the invention.

\Vhat is claimed is 1. A water tube boiler, comprising horizontally inclined tubes constituting the main bank, the front ends of which are lower than the rear ends, the tubes at each end being connected by a header and a series of downcomer water tubes extending from the front to the rear header, a baflle plate extending over the top of the main bank of tubes and beneath said down-comer tubes, whereby to prevent direct impingement of the products of combustion on said down-comer tubes throughout the major portion of their lengths, and a battle in the upper header extending across the same below the entrance to said down-comer tubes.

2. A water tube boiler comprising horizontally inclined tubes constituting the main bank, the front ends of which are lower than the rear ends, headers connecting the ends of the tubes, a steam and water drum above said bank of tubes, connections between the steam and water drum and said headers, and a series of down-comer tubes connecting the front and rear headers a bafile above the main bank of tubes and elow the down-comer tubes and protecting the said down-comer tubes from direct impingement of the products of combustion throughout the major portion of their length, said down-comer tubes being located below the water level of the boiler, and a bafile located in the upper header below the entrance to the down-comer tubes and below the water level of the boiler, said baflie restricting the area of the upper header and being adapted to direct water into said down-comer tubes.

3. A water tube boiler comprising a bank of water tubes, front and rear headers connected to said tubes, a series of downcomer water tubes extending from the front to the rear header, means for protecting said tubes from the direct heat of the products of combustion throughout the major portion of the length of said tubes, whereby the tubes are maintained at temperatures which are low with relation to the tubes of the main bank to cause a downward circulation of water from the higher to the lower header, and a baffle in the higher header extending across the same below the entrance to said downcomer tubes.

4:. A water tube boiler comprising horizontally inclined tubes, constituting the main bank, the front ends of which are lower than the rear ends, the tubes at each end being connected by headers, and a series of downcomer water tubes extending from the front to the rear header, means for protecting said tubes from the direct heat of the products of combustion throughout the major portion of the lengths of said tubes whereby the tubes are maintained at temperatures which are low with relation to the tubes of the main bank to cause a downward circulation of water from the higher to the lower header, and a bafiie in the higher header extending across the same below the entrance to said downcomer tubes.

In Witness I whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

THOMAS T. PARKER.

Witnesses:

E. V. MYERS, C. L. RUSSELL. 

